Initial commit
 added try-catch block in PlaySound, cleanup
Added GameModePickerActivity
Redesign of GameModePickerActivity.xml
Redesign of GameModePickerActivity.xml part 2
fixed behaviour wirh incorrectly working buttons, added putExtra, expanded skillQuiz constructor
changed class name
added new game mode DeadMeatch
estetic fix in gameModePicker
Aded 2 new game modes
changed class name
cleanup
fixed random method in single Random Mode
fixed GUI in Game Mode Picker
DataBase added
used database in code
added tabs, small refactor
added tabs, fixed buttons
refactor in quiz instances
added list adapter